Add support for the "html" alternative of mx-refuse-import.

ChangeLog

+2003-08-28  Kent Engstrm  <kent@lysator.liu.se>
+
+        Add support for the "html" alternative of mx-refuse-import.
+	* run-support/aux-items.conf: Update validation regexp. Also
+	set the unique flag to false.
+	* doc/Protocol-A.texi (Aux-Item Types): Document "html".
+	* doc/constructs.expected: Add @code{html}.
+
 2003-08-28  Per Cederqvist  <ceder@ceder.dyndns.org>
 
 	Don't crash if a person has read more than 65535 texts after the

doc/Protocol-A.texi

@@ -10079,6 +10079,10 @@ conference or letterbox as a recipient if the mail is considered to be
 spam according to some importer specific criteria (such as the presence
 of SpamAssassin flags).
 
+If the data is the string @code{html}, the importer will not add this
+conference or letterbox as a recipient if the mail is considered to be
+in HTML format.
+
 In the future, other alternatives in addition to the above may be
 defined for this aux-item. An importer should silently ignore
 unrecognized ones. If more than one aux-item of this type is present,

doc/constructs.expected

@@ -34,6 +34,7 @@
 @code{description}
 @code{error-reply}
 @code{followups-to}
+@code{html}
 @code{integer}
 @code{items-to-add}
 @code{items-to-delete}